How you use the boat is how you should prop the boat. We used the big boat for a month and found we cruised at 3,000 rpm. Any faster and the wind noise made conversation difficult and the women hair is blowing too much.. I called my prop guy and told him I wanted the most efficient prop at 3,000 rpm. We now can cruise at 2,800 at the same speed. It saves me gas every trip. Very few people run WOT for long in a pontoon. Look at the boat tests to see the fuel burn on higher speeds.